Stepper Drivers

I'm sure Geckodrive (.com) has something suitable.  They have a huge
following in the homebrew CNC community[*].

[*] I'm not sure what your customer will do with all the free magnetic
geckos they'll get.

--
Ben Jackson AD7GD
http://www.ben.com /

On Mon, 13 Aug 2007 17:55:10 -0500, Ben Jackson wrote:

Make Geico ads? ;-)

Cheers!
Rich

Tim Wescott wrote:


If Ben's suggestion doesn't pan out and it's urgent give Allegro a call.
  Their app engineers and sales guys should know which of their
customers sell similar modules. Allegro makes tons of motor driver
chips. I am not all that fond of them because of noise issues but that's
another story.

http://www.allegromicro.com/en/

   1-508-853-5000

--
Regards, Joerg

http://www.analogconsultants.com

parts:http://www.interinar.com/stepper%20driver%20BSD-02.htm , but the vendor is

That driver is based on the Allegro A3977:
http://www.allegromicro.com/en/Products/Part_Numbers/3977/

If he wants, he could easily design his own PCB's for that driver chip
with a few current sense resistors and capacitors.  If not, xylotex
makes a driver using the A3977 as well: http://www.xylotex.com /

On Tue, 14 Aug 2007 00:18:26 +0000, Zach_G wrote:


parts:http://www.interinar.com/stepper%20driver%20BSD-02.htm , but the vendor is

That looks like a very good candidate -- I'll dig into their data sheet
soon.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

Check out http://www.imshome.com/ Intelligent Motion Systems.

Good Luck
george

["Followup-To:" header set to sci.electronics.design.]
Tim Wescott wrote:


Speaking of datasheets -- has anybody yet figured out how to find
datasheets on Allegro's website?

robert

Tim Wescott wrote:

Is there a size constraint? I could easily do that with a 68HC11, some
FETs and a suitable power supply; so could you.

Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

Jerry Avins wrote:


But they probably need some Monday next week ;-)

--
Regards, Joerg

http://www.analogconsultants.com

On Mon, 13 Aug 2007 18:09:55 -0700, Joerg wrote:


Precisely.  We're buying time to market by putting things together from
modules as much as possible.  At some point in the future we may decide
on doing something like that as a cost reduction -- for now, being able to
lash it all together from parts while we concentrate on the really unique
parts of the system is driving us to purchase things at the highest level
of integration that we can.

I'm not sure you could achieve nice microstepping with a 68HC11, but one
could certainly do it with some of the more modern chips with richer PWM
resources.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

Tim Wescott wrote:


If it's like in the med devices biz the trick is to create some
universally useful blocks, along with tested avenues for rapid
prototyping. But that takes time and resources to set up.



Looks more like an FPGA job. If noise isn't an issue the Allegro chips
do a fine job. I can't really use them though because the T-off times
flop around like crazy.

--
Regards, Joerg

http://www.analogconsultants.com